Sorry to sound nieve but which part is the 'old' hall?
LS will have ORK and PMI check-in early on Mondays, with a mid-morning check-in for AGP and MJV.
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Sorry but I tried Car Park L today and there's no way I can be bothered to walk that far on an early or late. I shall just park in another car park, especially when car park A is sitting empty!!